Vanilla Mug Cake

Bahan-bahan (1 porsi)

• ¼ cup all-purpose flour
• ½ tablespoon cornstarch
• ½ teaspoon baking powder
• 2 tablespoons salted butter
• 3 tablespoons granulated sugar
• 1 teaspoon vanilla extract
• 3 tablespoons milk
• ½ teaspoon sprinkles (optional)